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Image forming apparatus

Active Publication Date: 2020-09-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention aims to provide an image forming apparatus that can increase the distance between transfers while reducing color misregistration. The invention has a simple constitution and is easy to use.

Problems solved by technology

For this reason, due to cause such as mechanical accuracy, speed non-uniformity or the like of a plurality of photosensitive drums, a transfer belt and a feeding belt occur for each of colors at different times in some cases, so that when color images do not coincide with each other when the color images are superposed and thus color misregistration occurs.
The unsteady color misregistration occurs due to a rotation speed fluctuation or the like of the photosensitive drums and a driving roller or the like for the transfer belt and the feeding belt.
However, a problem such that the photosensitive drums are disposed so that the time interval is the integral multiple of the drive non-uniformity period of the driving roller and therefore a degree of freedom of arrangement of the respective photosensitive drums is suppressed, and a problem such that arrangement of the respective photosensitive members is restricted to the interval of the integral multiple of the outer peripheral length of the driving roller and therefore a degree of freedom of arrangement of the respective photosensitive members is suppressed arose.

Method used

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first embodiment

[0033]A structure of an image forming apparatus 100 according to the present invention in a first embodiment will be described with reference to FIGS. 1 to 5.

[0034]The structure of the image forming apparatus 100 including an intermediary transfer belt 12a will be described. FIG. 1 is a sectional view showing the structure of the image forming apparatus 100 including the intermediary transfer belt 12a. The image forming apparatus 100 is an example of a color laser printer. The image forming apparatus 100 shown in FIG. 1 includes four (plurality of) photosensitive drums 1Y, 1M, 1C and 1K as image bearing members corresponding to colors of yellow (Y), magenta (M), cyan (C) and black (K), respectively. Incidentally, for convenience of explanation, description is made using the photosensitive drum 1 representing the photosensitive drums 1Y, 1M, 1C and 1K in some cases. This is true for other image forming process means.

[0035]Each photosensitive drum 1 is rotationally driven in a clockwi...

modified embodiment

[0123]The transmission ratio i (=10) in this embodiment is a large transmission ratio i. For this reason, for example, even when the number of teeth Z1 of the driving roller gear 29 is 149 (=150−1), and the number of teeth Z2 of the motor gear 30 is 15, the transmission ratio i (=Z1 / Z2=149 / 15=9.93) is not changed remarkably. For this reason, the color misregistration in the entirety of the image forming apparatus 100 can be suppressed.

[0124]Also in this case, the inter-transfer-position distance LMC as the first inter-transfer-position distance between the primary transfer position 27M for the magenta M and the primary transfer position 27C for the cyan C which are disposed adjacent to each other along the intermediary transfer belt 12a is “N×A”. Here, N (N: integer) is the number of rotations at which the driving roller 12b rotates during movement of the predetermined position of the center 12a1 of the intermediary transfer belt 12a with respect to the thickness direction, and is “...

second embodiment

[0140]Next, by using FIGS. 6 to 9, a structure of an image forming apparatus 100 according to the present invention in a second embodiment will be described. Incidentally, constituent elements similar to those in the first embodiment described above are represented by the same reference numerals or symbols or by different reference numerals or symbols in some instances, and will be omitted from description. Part (a) of FIG. 6 is a sectional view showing a structure of a drive transmission device 28 for the intermediary transfer belt 12a in this embodiment, and part (b) of FIG. 6 is an enlarged view of a portion G shown in part (a) of FIG. 6. Part (a) of FIG. 7 is an illustration of a relationship between rotation non-uniformity of a driving roller gear 29 alone and each primary transfer position 27 in this embodiment, and part (b) of FIG. 7 is an illustration of a relationship between rotation non-uniformity of a driving roller pre-stage gear alone and each primary transfer position...

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Abstract

An image forming apparatus includes an intermediary transfer belt, first to third image bearing members, a driving member, and first and second drive transmission members, and includes first to third transfer positions. A first inter-transfer-position distance between the first and second transfer positions and the second inter-transfer-position distance between the second and third transfer positions are different from each other. The first inter-transfer-position distance is set at “N×A” and the second inter-transfer-position distance is set at “N×A±N×A / i”, where N is an integer of rotations of the driving member during to movement of the belt in the first inter-transfer-position distance, A is a distance of movement of the belt when the driving member rotates through one-full circumference, and i is a transmission ratio between the first and second drive transmission members.

Description

FIELD OF THE INVENTION AND RELATED ART[0001]The present invention relates to an image forming apparatus such as a copying machine or a printer.[0002]Conventionally, as the image forming apparatus of an electrophotographic type, there is an image forming apparatus of a tandem type for forming a full-color image. The image forming apparatus of the tandem type includes a plurality of image forming portions. For this reason, due to cause such as mechanical accuracy, speed non-uniformity or the like of a plurality of photosensitive drums, a transfer belt and a feeding belt occur for each of colors at different times in some cases, so that when color images do not coincide with each other when the color images are superposed and thus color misregistration occurs.[0003]The color misregistration includes two types consisting of steady color was misregistration and unsteady color misregistration. The steady color misregistration occurs due to a deviation or the like of assembling positions o...

Claims

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Application Information

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IPC IPC(8): G03G15/16
CPCG03G15/1615
Inventor INO, KAZUSHIYAMAZAKI, HIROYUKIKAWAMURA, HIROSHI
Owner CANON KK
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